Engineered for commercial, industrial, and high-density residential power distribution with proven arc-extinguishing and thermal-magnetic trip technologies.
Wenzhou OFA Electrical Technology Co., Ltd. is a specialized enterprise in the distribution switchgear and control equipment industry in China. Founded in 2013, the company is deeply rooted in Yueqing, Wenzhou—widely recognized as the Capital of Electrical Appliances in China. Operating under its proprietary "OFA" brand, the company engineers advanced electrical protection and energy efficiency systems tailored for power grids, renewable energy, industrial automation, commercial construction, and equipment manufacturing.
Rooted in Yueqing for over a decade, OFA has consistently delivered distribution switchgear, control gear, and low-voltage accessories characterized by thermal stability, high breaking capacity, and structural durability. Upholding honest and law-abiding operations, OFA has earned the prestigious Tax Credit Grade A rating for seven consecutive years, solidifying long-term strategic partnerships with over 780 international clients across 50+ countries.
An engineering breakdown of thermal-magnetic trip units, arc suppression chambers, contact resistance reduction, and environmental durability in OFAFT Series Miniature Circuit Breakers (MCBs).
The OFAFT series features high-precision bimetallic strips for inverse-time delayed thermal protection against sustained overloads, alongside instantaneous electromagnetic coils for instant short-circuit tripping under 10 milliseconds.
Incorporates a 12-plate splitter arc chute engineered to rapidly stretch, cool, and extinguish electric arcs during fault interruption, minimizing contact erosion and extending mechanical endurance to over 20,000 cycles.
Manufactured using high-grade AgCdO / AgZnO contact tips, lowering internal contact resistance, mitigating temperature rise at nominal current rating (In up to 63A), and guaranteeing 6kA/10kA breaking standard compliance.
The OFAFT series is available in 1P, 2P, 3P, and 4P pole configurations supporting B, C, and D instantaneous tripping characteristics:
How Yueqing’s world-class low-voltage electrical industrial cluster empowers OFA to deliver zero-defect components with unmatched cost efficiency.
Equipped with high-speed automated riveting machines, laser marking lines, and digital CCD vision inspection stations. Every single breaker undergoes 100% full inspection SOPs covering instantaneous tripping, thermal calibration, dielectric withstand voltage, and mechanical latching stability.
OFA operates under certified ISO9001 Quality Management Systems. Raw materials, including polyamide flame-retardant housings (UL94-V0 rated) and copper conduction plates, are subjected to incoming material control (IQC) before entering production lines.
Capitalizing on Wenzhou's port infrastructure and localized supply chain synergy, OFA handles high-volume urgent orders, offering fast lead times, secure export-grade moisture-proof packaging, and complete customs clearance documentation.
From renewable clean energy to heavy commercial automation, OFA provides tailored switchgear protection engineered for tough operational environments.
Reliable terminal distribution boards protecting household appliances, smart lighting circuits, and HVAC systems against electrical fires and shock hazards.
High-density switchboards in shopping malls, office towers, and public infrastructure requiring selective tripping and stable continuous power supply.
Specialized DC MCBs and MCCBs (e.g., DCOF1 Series) engineered for photovoltaic combiner boxes, string inverters, and battery energy storage systems (BESS).
Integrated residual current devices (RCBO / RCCB) providing Type A and Type B earth leakage protection for AC/DC fast EV chargers.
Zero-downtime protection for server racks, power distribution units (PDUs), and UPS backup power infrastructure.
Precision DIN-rail mounted circuit protection for industrial PLC panels, robotic controllers, and motor control centers (MCC).
Next-generation intelligent breakers featuring energy metering telemetry, remote wireless tripping, and smart cloud status monitoring.
Heavy-duty air circuit breakers (ACB) and MCCBs built for municipal grids, sub-stations, water treatment facilities, and airports.
Pioneering the transition from traditional passive breaking to active intelligent energy management.
Integrating digital signal processors (DSP) to analyze high-frequency current waveforms, enabling active detection of dangerous series and parallel arcs before insulation failure causes electrical fires.
Incorporating embedded micro-sensors to measure contact point temperature rises and wear degradation in real-time, transmitting diagnostic data via RS485 / Modbus / Wi-Fi to cloud SCADA platforms.
Committed to environmental stewardship by utilizing halogen-free, RoHS-compliant thermoplastics and energy-efficient vacuum soldering processes to reduce carbon footprint in manufacturing.
From miniature circuit breakers (MCB) and molded case circuit breakers (MCCB) to air circuit breakers (ACB), residual current breakers (RCCB/RCBO), and isolation switches (IS).
OFW1 Intelligent Universal Air Circuit Breakers designed for main incoming distribution frames up to 6300A with intelligent trip controllers.
OFC and NB1L Series combining overload, short-circuit, and high-sensitivity earth leakage trip mechanisms in compact modular units.
OFIS Series isolating switches designed to provide safe galvanic isolation during maintenance and system upgrades.
Partnering with international electrical brand owners, system integrators, and EPC contractors to deliver custom low-voltage solutions.
Ideal for panel builders and distributors seeking high quality at competitive factory-direct pricing.
Tailored for global brands requiring private labeling, custom housing colors, and specialized electrical parameters.
Direct glimpse into our state-of-the-art Yueqing plant, automated testing labs, and global trade exhibitions.
Read why international system integrators and plant engineers rely on OFA for stable low-voltage circuit protection.
"As a system integrator in Poland, we have collaborated with OFA on several industrial automation projects. Their product range is comprehensive, from MCBs to communication gateways. The quality is consistent, eliminating on-site commissioning issues."
"We purchased OFA intelligent power monitoring units and OFAFT MCBs for upgrading our workshop power distribution. The units have operated seamlessly for over a year, and technical documentation is crystal clear."
"Deploying OFA's circuit protection and energy efficiency systems across several commercial properties was a wise decision. They provide excellent remote technical support via email and video calls."
Comprehensive answers regarding OFAFT Series specifications, factory capabilities, procurement policies, and technical support.
The OFAFT series features a reinforced 12-plate arc-extinguishing chute combined with silver-alloy contacts (AgCdO/AgZnO), delivering rapid arc quenching and stable 6kA/10kA short-circuit interrupting performance under IEC/EN 60898-1 standards.
OFA is located in Yueqing, Wenzhou City, Zhejiang Province—the central hub of China's low-voltage electrical industry. This location grants us direct access to world-class raw material suppliers and streamlined logistics networks.
Yes! We provide deep customization for OEM clients, including custom trip curve calibrations (B, C, or D curves), rated currents from 1A to 63A, specific terminal connector styles, and personalized branding laser marking.
Our core low-voltage protection lines hold CE, IEC 60898-1, IEC 60947-2, and CCC certifications. Production lines operate strictly under the ISO9001 quality management framework.
We offer comprehensive technical consultation, wiring schematics, CAD drawings, sample testing, remote video debugging, and complete post-delivery operational documentation for engineering partners worldwide.
Standard stock components feature flexible low MOQs. For customized OEM products, production lead time typically ranges from 15 to 25 days depending on tooling requirements and order volume.
Browse our extended catalog of 4-pole MCBs, heavy-duty MCCBs, and specialized earth leakage protection switches.
Contact Wenzhou OFA Electrical Technology Co., Ltd. for factory-direct quotes, technical parameter documentation, and customized OEM/ODM project support.
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